When I was changing my air-filter for the first time (14,000 miles) I started to undo the air box clamps to take out the old air filter. When doing so I noticed that the hose leading to the engines air intake completely came off. When I inspected the screw/clamp that holds the air hose in place it was VERY loose and basically was just in-place this whole time without and airtight seal. I was also a little surprised that the air filter was not as dirty as I thought it would be.
I put in the new filter and tightened the clamp with a good 6-7 turns. I wondered how this could happen and only solution I could think of was either the dealer took it off and forgot to tighten it when they replaced the water-pump at about 3,000 miles or someone opened opened my hood and did this just for the fuck of it.
Before discovering this I've felt like the engine was being sluggish compared to when it was newer. I could be a little paranoid but is this reason for concern? Should I take it to the dealer and bring this up for a check-up?